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L-Phenylalanine benzyl ester hydrochloride H-PHE-TRP-OH L-Phenylalaninamide hydrochloride H-PHE-PHE-OME HCL Methyl L-phenylalaninate hydrochloride H-PHE-OBZL P-TOSYLATE (S)-AMINO-(4-CHLORO-PHENYL)-ACETIC ACID (DES-TYR1)-LEU-ENKEPHALIN BOC-LEU-ENKEPHALIN BOC-PHE-LEU-OH